C99 example (よくつかいそうなのだけ)

c99.c

// C99 example
//
// $ gcc -std=c99 c99.c -o c99

#include <stdio.h>
#include <stdbool.h>            // bool, true, false

// bool sample
// return true if x is even, otherwise return false
bool even_p(int x)
{
    return (x % 2)? false:true;
}

// __func__ sample
void hoge(void)
{
    printf("here is %s() in file:%s at line:%d\n", __func__, __FILE__, __LINE__);
}

// compound literal
typedef struct
{
    int x;
    int y;
} Point;

void plot(const Point *p)
{
    printf("x:%3d, y:%3d\n", p->x, p->y);
}

int main(void)
{
    printf("odd: ");
    
    for(int i=0; i<20; i++) {
        if(even_p(i)) continue;
        printf("%d, ", i);
    }
    printf("\n");

    hoge();

    plot(&(Point){.x = 10, .y = 20});
}

result.txt

$ gcc -std=c99 c99.c -o c99; ./c99
odd: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,
here is hoge() in file:c99.c at line:18
x: 10, y: 20